全海深大视场超高清光学系统设计

为满足我国深海成像设备需求, 针对水下光学像差特点完成了全海深大视场光学成像系统设计。根据深海系统使用环境, 对光学参数与结构形式进行了分析与探讨; 采用常用玻璃及球面透镜设计, 完成了小型化低成本高性能的光学设计实例; 通过控制光线角度来提高光学系统能量利用率。选用YAG透明陶瓷为抗压窗口材料, 通过有限元力学分析仿真获得形变与抗压阈值。通过ANSYS软件分析窗口与支撑结构, 设计满足全海深11 000 m使用环境(120 MPa)要求。光学系统的工作波段为410~630 nm,视场角达80°, 相对孔径为1/2.8, 全视场MTF>0.3(@91 lp/mm)。该系统成像质量及光学窗口抗压性均满足深海成像科考需求。

Abstract

In order to meet the needs of deep-sea imaging devices in China, a whole deep-sea wide-field-of-view optical imaging system was designed based on the aberration characteristics of an underwater optical system. According to the operating environment of the deep-sea system, the optical parameters and structural forms were analyzed. A sample optical design characterized by miniaturization, low cost, and high performance was completed using common glass and spherical lens. The energy utilization of the optical system was improved by controlling the light angle. With YAG transparent ceramics as a material for anti-compression window, the deformation and anti-compression thresholds were obtained by finite-element mechanical analysis and simulation. Analysis of the window and supporting structure using ANSYS software suggests that the design met the requirements for use in 11,000 m whole deep-sea environment (110 MPa). The operating band of the optical system is 410~630 nm, the field-of-view angle reaches 80°, the relative aperture reaches 1/2.8, and the MTF of the full field-of-view>0.3 (@91 lp/mm). The imaging quality of the system and the anti-compression performance of the optical window meet the needs of deep-sea imaging for scientific investigation.

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全海深大视场超高清光学系统设计

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